1 // SPDX-License-Identifier: GPL-2.0
2
3 /*
4 * Copyright 2020 Google LLC.
5 */
6
7 #include <test_progs.h>
8 #include "modify_return.skel.h"
9
10 #define LOWER(x) ((x) & 0xffff)
11 #define UPPER(x) ((x) >> 16)
12
13
run_test(__u32 input_retval,__u16 want_side_effect,__s16 want_ret)14 static void run_test(__u32 input_retval, __u16 want_side_effect, __s16 want_ret)
15 {
16 struct modify_return *skel = NULL;
17 int err, prog_fd;
18 __u32 duration = 0, retval;
19 __u16 side_effect;
20 __s16 ret;
21
22 skel = modify_return__open_and_load();
23 if (CHECK(!skel, "skel_load", "modify_return skeleton failed\n"))
24 goto cleanup;
25
26 err = modify_return__attach(skel);
27 if (CHECK(err, "modify_return", "attach failed: %d\n", err))
28 goto cleanup;
29
30 skel->bss->input_retval = input_retval;
31 prog_fd = bpf_program__fd(skel->progs.fmod_ret_test);
32 err = bpf_prog_test_run(prog_fd, 1, NULL, 0, NULL, 0,
33 &retval, &duration);
34
35 CHECK(err, "test_run", "err %d errno %d\n", err, errno);
36
37 side_effect = UPPER(retval);
38 ret = LOWER(retval);
39
40 CHECK(ret != want_ret, "test_run",
41 "unexpected ret: %d, expected: %d\n", ret, want_ret);
42 CHECK(side_effect != want_side_effect, "modify_return",
43 "unexpected side_effect: %d\n", side_effect);
44
45 CHECK(skel->bss->fentry_result != 1, "modify_return",
46 "fentry failed\n");
47 CHECK(skel->bss->fexit_result != 1, "modify_return",
48 "fexit failed\n");
49 CHECK(skel->bss->fmod_ret_result != 1, "modify_return",
50 "fmod_ret failed\n");
51
52 cleanup:
53 modify_return__destroy(skel);
54 }
55
test_modify_return(void)56 void test_modify_return(void)
57 {
58 run_test(0 /* input_retval */,
59 1 /* want_side_effect */,
60 4 /* want_ret */);
61 run_test(-EINVAL /* input_retval */,
62 0 /* want_side_effect */,
63 -EINVAL /* want_ret */);
64 }
65
66